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Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin
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The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%
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(1)/(4)(x+y)-(3)/(6)y+(2)/(9)x-8x+4 y...
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